Disgraced Tour de France winner Lance Armstrong would need "something close to a miracle" to get his lifetime ban from cycling re-examined, World Anti-Doping Agency (WADA) president John Fahey has claimed.

Cycling's world governing body the UCI is willing to provide an amnesty for those who give evidence to its independent commission on drug use in the sport, providing that does not contravene the World Anti-Doping Agency code.